<template>
  <div>
    <!-- 面包屑 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
        <el-alert title="注意：只允许为第三级分类设置相关参数" type="warning" show-icon :closable="false"></el-alert>
        <!-- 选择商品分类区域 -->
        <el-row class="cat_opt">
            <el-col>
                <span>选择商品分类：</span>
                <!-- 选择商品分类的级联选择框 -->
                <el-cascader
                    v-model="value"
                    :options="cateList"
                    :props="cateProps"
                    @change="handleChange">
                </el-cascader>
            </el-col>
        </el-row>
        <!-- tab 页签区域 -->
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
            <!-- 添加动态参数的面板 -->
            <el-tab-pane label="动态参数" name="many" >
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
                <!-- 动态参数表格 -->
                <el-table :data="manyTableData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleChose(i,scope.row)">{{item}}</el-tag>
                            <!-- 输入文本框 -->
                            <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                            </el-input>
                            <!-- 添加的按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <el-table-column type="index" label="#"></el-table-column>
                    <el-table-column prop="attr_name" label="参数名称"></el-table-column>
                    <el-table-column label="操作">
                    <template slot-scope="scope">
                        <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                        <el-button size="mini" type="danger" icon="el-icon-delete" @click="deleteParams(scope.row.attr_id)">删除</el-button>
                    </template>
            </el-table-column>
                </el-table>
            </el-tab-pane>
            <!-- 添加静态参数的面板 -->
            <el-tab-pane label="静态属性" name="only">
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
                <!-- 静态属性表格 -->
                <el-table :data="onlyTableData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleChose(i,scope.row)">{{item}}</el-tag>
                            <!-- 输入文本框 -->
                            <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                            </el-input>
                            <!-- 添加的按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <el-table-column type="index" label="#"></el-table-column>
                    <el-table-column prop="attr_name" label="属性名称"></el-table-column>
                    <el-table-column label="操作">
                    <template slot-scope="scope">
                        <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                        <el-button size="mini" type="danger" icon="el-icon-delete" @click="deleteParams(scope.row.attr_id)">删除</el-button>
                    </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
        </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
        :title="'添加' + titleText"
        :visible.sync="addDialogVisible"
        width="50%"
        @close="addDialogClosed">
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
    </el-dialog>
    <!-- 编辑参数对话框 -->
    <el-dialog
        :title="'添加' + titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        @close="editDialogClosed">
        <el-form :model="editForm" :rules="addFormRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
    </el-dialog>
  </div>
</template>

<script>
import {cateList,getParams,addParams,editParams,editParamsInfo,deleteParams} from '@/api'
export default {
    name:'Params',
    data() {
        return {
            // 商品分类列表
            cateList:[],
            cateProps:{
                expandTrigger: 'hover',
                value:'cat_id',
                label:'cat_name',
                children:'children',
            },
            // 级联选择框双向绑定的数组
            value:[],
            // 被激活的页签的名称
            activeName:'many',
            // 动态参数的数据
            manyTableData:[],
            // 静态属性的数据
            onlyTableData:[],
            // 控制添加对话框的显示与隐藏
            addDialogVisible:false,
            // 添加参数的表单数据对象
            addForm:{
                attr_name:''
            },
            addFormRules: {
                attr_name: [
                    { required: true, message: '请输入参数名称', trigger: 'blur' },
                ],
            },
            // 控制修改对话框的显示与隐藏
            editDialogVisible:false,
            // 修改的表单数据对象
            editForm:{},
            // 控制按钮与文本框的切换显示
            // inputVisible: false,
            // inputValue:''
        }
    },
    created() {
        this.getcateList()
    },
    methods: {
        // 获取所有的商品分类列表
        getcateList(){
            cateList().then(({data:res})=>{
                console.log(res);
                if(res.meta.status == 200){
                    this.cateList = res.data
                }else{this.$message.error('获取分类列表失败')}
            })
        },
        // 级联选择框选中项变化，会触发这个函数
        handleChange(){
            // console.log(this.value);
            // 当选择的不是三级分类时，禁用按钮，并清空表格数据
            if(this.value.length !== 3){
                this.value = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            // 证明选择的是三级分类
            // 根据所选分类的Id,和当前所处的面板,获取对应的参数
            this.getParamsData()
        },
        // tab页签点击事件的处理函数
        handleTabClick(){
            console.log(this.activeName);
            this.getParamsData()
        },
        // 获取参数列表数据
        getParamsData(){
            // 根据所选分类的Id,和当前所处的面板,获取对应的参数
            getParams(this.cateId,{params:{sel:this.activeName}}).then(({data:res})=>{
                if(res.meta.status == 200){
                    // 将attr_vals变为数组,在遍历tag标签时用
                    res.data.forEach(item => {
                        // 使用split进行分割
                        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                        //控制文本框的显示与隐藏
                        item.inputVisible = false
                        //文本框中输入的值
                        item.inputValue = ''
                    })
                    // console.log(res.data);
                    // 获取完数据需要进行判断,分别存入对应的data中
                    if(this.activeName === 'many'){
                        this.manyTableData = res.data
                    }else{
                        this.onlyTableData = res.data
                    }
                }else{this.$message.error('获取参数列表失败')}
            })
        },
        // 监听添加对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        // 添加参数
        addParams(){
            this.$refs.addFormRef.validate((valid) => {
                if (valid) {
                    addParams(this.cateId,{attr_name:this.addForm.attr_name,attr_sel:this.activeName,
                        }).then(({data:res})=>{
                            if(res.meta.status == 201){
                                this.$message({message: '添加参数成功',type: 'success'});
                                this.addDialogVisible = false
                                this.getParamsData()
                            }else{this.$message.error('添加参数失败')}
                    })
                }
            });
        },
        // 点击修改按钮根据Id查询当前参数的信息
        showEditDialog(attr_id){
            this.editDialogVisible = true
            editParams(this.cateId,attr_id,this.activeName).then(({data:res})=>{
                if(res.meta.status == 200){
                    this.editForm = res.data
                }else{this.$message.error('获取参数失败')}
            })
        },
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        // 点击确定按钮提交编辑
        editParams(){
            this.$refs.editFormRef.validate((valid) => {
                if (valid) {
                    editParamsInfo(this.cateId,this.editForm.attr_id,{attr_name:this.editForm.attr_name,attr_sel:this.activeName}).then(({data:res})=>{
                        if(res.meta.status == 200){
                            this.$message({message: '修改参数成功',type: 'success'});
                            this.getParamsData()
                            this.editDialogVisible = false
                        }else{this.$message.error('修改参数失败')}
                    })
                }
            });
        },
        // 删除参数
        deleteParams(attr_id){
            this.$confirm('此操作将永久删除, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
                }).then(() => {
                deleteParams(this.cateId,attr_id).then(({data:res})=>{
                    if(res.meta.status == 200){
                        this.$message({type: 'success',message: '删除成功!'});
                        this.getParamsData()
                    }else{this.$message.error('删除失败')}
                })
                
                }).catch(() => {
                this.$message({
                    type: 'info',
                    message: '已取消删除'
                });          
            });
        },
        // 点击按钮显示文本输入框
        showInput(row) {
            row.inputVisible = true;
        // 让文本框自动获得焦点
        // $nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
        // 如果不适用该方法，input还没放入页面，执行获取焦点，此时input不存在
            this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        //文本框失去焦点或按下了Enter都会触发
      handleInputConfirm(row) {
        // let inputValue = row.inputValue;
        if (row.inputValue.trim().length === 0) {
            row.inputValue = '';
            row.inputVisible = false;
            return
        }
        row.attr_vals.push(row.inputValue.trim());
        row.inputVisible = false;
        row.inputValue = '';
        //需要发起请求，保存这次操作
        this.saveAttrVals(row)
      },
      // 将对 attr_vals 的操作，保存到数据库
      saveAttrVals(row){
        const data = {
            attr_name:row.attr_name,
            attr_sel:row.attr_sel,
            attr_vals:row.attr_vals.join(' ')
        }
        editParamsInfo(this.cateId,row.attr_id,data).then(({data:res})=>{
            if(res.meta.status == 200){
                this.$message({message: '修改参数项成功',type: 'success'});
            }else{this.$message.error('修改参数项失败')}
        })
      },
    //   点击x号，删除对应的参数可选项
      handleChose(i,row){
        row.attr_vals.splice(i,1)
        this.saveAttrVals(row)
      }
    },
    computed:{
        // 如果按钮需要被禁用,则返回true,否则返回false
        isBtnDisabled() {
            if(this.value.length === 3){
                return false
            }else{
                return true
            }
        },
        // 当前选中的三级分类的Id
        cateId(){
            return this.value[2]
        },
        //动态激活标题的文本
        titleText(){
            if(this.activeName === 'many'){
                return '动态参数'
            }else{
                return '静态属性'
            }
        }
    }
}
</script>

<style lang="less" scoped>
    .cat_opt{
        margin: 15px 0;
    }
    .el-tag {
        margin: 5px;
    }
    .button-new-tag {
    height: 32px;
    line-height: 30px;
    padding-top: 0;
    padding-bottom: 0;
  }
  .input-new-tag {
    width: 120px;
    vertical-align: bottom;
  }
</style>